A 3.9 mole sample of uranium decays until only 3 moles remain. How many grams of uranium decayed? (Not remained)

Which statement about sound is not true? a. air particles travel with sound waves. b. sound waves cannot travel through a vacuum. c. sound waves exist even if no one hears them. d. air particles vibrate along the path of a sound wave.

V1t2 = v2t1 is an expression of who’s law

In a ball-and-stick molecular model, what do the sticks represent?